<?php
/**
 * Handle data for the current customers session.
 *
 * @class       WC_Session
 * @version     2.0.0
 * @package     WooCommerce/Abstracts
 * @category    Abstract Class
 * @author      WooThemes
 */
abstract class WC_Session {

    /** customer_id */
    protected $_customer_id;

    /** _data  */
    protected $_data = array();

    /** When something changes */
    protected $_dirty = false;

    /**
     * __get function.
     *
     * @access public
     * @param mixed $key
     * @return mixed
     */
    public function __get( $key ) {
        return $this->get( $key );
    }

    /**
     * __set function.
     *
     * @access public
     * @param mixed $key
     * @param mixed $value
     * @return void
     */
    public function __set( $key, $value ) {
        $this->set( $key, $value );
    }

     /**
     * __isset function.
     *
     * @access public
     * @param mixed $key
     * @return bool
     */
    public function __isset( $key ) {
        return isset( $this->_data[ sanitize_title( $key ) ] );
    }

    /**
     * __unset function.
     *
     * @access public
     * @param mixed $key
     * @return void
     */
    public function __unset( $key ) {
        if ( isset( $this->_data[ $key ] ) ) {
            unset( $this->_data[ $key ] );
            $this->_dirty = true;
        }
    }

    /**
     * Get a session variable
     *
     * @param string $key
     * @param  mixed $default used if the session variable isn't set
     * @return mixed value of session variable
     */
    public function get( $key, $default = null ) {
        $key = sanitize_key( $key );
        return isset( $this->_data[ $key ] ) ? maybe_unserialize( $this->_data[ $key ] ) : $default;
    }

    /**
     * Set a session variable
     *
     * @param string $key
     * @param mixed $value
     */
    public function set( $key, $value ) {
        $this->_data[ sanitize_key( $key ) ] = maybe_serialize( $value );
        $this->_dirty = true;
    }

    /**
     * get_customer_id function.
     *
     * @access public
     * @return void
     */
    public function get_customer_id() {
        return $this->_customer_id;
    }
}